Their appearances at the Green Mill Jazz Club and elsewhere built a large and loyal following in Chicago and beyond, the three having achieved a degree of synchronicity and mutual intuitiveness not routinely encountered.

But like many long-running ensembles, Deep Blue eventually disbanded, leaving Broom to put together another band when Steely Dan invited him to serve as opening act for a 2014 tour. Ever since, Broom has been championing his new Organi-Sation, which played the Green Mill Jazz Club successfully last summer and opened a still more impressive four-night engagement Thursday evening at the Jazz Showcase.